Vinnie Murphy's Law
I have a 1986 Volvo 240DL with 75,000 miles on it and all original belts. As long as I'm going to replace the alternator belt and the timing belt, would it be a good idea to do the water pump at the same time? It's not leaking at the moment.
TOM: It probably would be a good idea, Rich. When they're changing the timing belt, it's very easy to replace the water pump. In fact, it's simply a matter of unscrewing five more bolts. So you're really just adding the cost of the part, which is about $75.
RAY: And Murphy's law (that's Vinnie Murphy, the mechanic) dictates that if you don't replace it, it'll definitely start leaking next week.
TOM: On the other hand, if you fix it now, you'll never be able to use the "my-water-pump-blew-on-the-expressway" excuse to take a day off from work. So think about that before you go off being prudent, Rich!